True...
Actually it would rather be really helpful in validating the code one wrote, by simply checking if each ROM call from the code shares the same address in both ROM versions - thus will work on any machine.

Dbug wrote:
That's doable.
Can you find me a decent picture of the cover, and provide the information (author, publisher, isbn, date, ...) and a brief description of the book in english?

Sorry, I have no more information. The author is Ramon, as I said, and it was published in January 1984 (according to the first page). I am not sure that it is nothing more than a collection of typed in pages, though the author states some "hundreds" of copies were distributed. What is very interesting is the content. It is quite a good book indeed!

BTW I nearly have a word file with the ROM addresses... Very little is left and I will post it here.

Well, L'Oric à Nu displays both Rom addresses in a very convenient way.
My main concern was that it would have been much easier to have this in a text file, so one can easily use the list to do easy automatic changes instead of having to check a book address after address